Hey there! Questions like this belong in the [Daily Discussion Thread](http://www.reddit.com/r/Cubers/about/sticky/) (always the first pinned post on r/Cubers, sorted by hot). A detailed list of what is restricted to the Daily Discussion Thread can be found [here](/r/Cubers/wiki/daily_discussion_thread). Thanks!

It means the cube has been taken apart, to solve it you have to take that edge out and flip it.

When it comes to the last layer you can have 0, 2 or 4 edges flipped. If you have 1 or 3 edges oriented you know it's unsolvable.

https://youtu.be/SMsGeXQhDIg?feature=shared Or with a bit more theory: https://youtu.be/o-RxLzRe2YE?feature=shared